What is the difference between the DNA of the Ti plasmid and T-DNA?
What will be an ideal response?
Ans: The Ti plasmid is about 200 kb in size. T-DNA is a 23 kb segment of the Ti plasmid that is actually transferred to the plant cell, and contains genes for tumor induction.
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Of the following taxonomic categories, which is the most inclusive?
A. class B. genus C. species D. family E. order
Which of the following is likely NOT a common feature shared among all living organisms?
A. All living organisms use energy. B. All living organisms maintain organization. C. All living organisms have evolved over the course of many generations. D. All living organisms maintain some level of homeostasis. E. All living organisms are composed of similar structures.
Photoperiodism is the ____
a. duration of flowering in a plant b. amount of light needed by a plant to exhibit normal growth c. response of a plant to the duration of light and darkness d. light phase of photosynthesis during which photolysis of water occurs e. opposite of photorespiration
In mammals, embryonic cells form an inner cell mass that will become the body of the embryo and a layer of surrounding cells that will become the chorionic membrane and placenta. What are these surrounding cells called?
A. Yolk B. Trophoblast C. Blastodisc D. Blastocoel